altostratus
American Heritage Dictionary:
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al·to·stra·tus
(ăl'tō-strā'təs, -străt'əs) 
n.
An extended cloud formation of bluish or gray sheets or layers.
n.
An extended cloud formation of bluish or gray sheets or layers.
[Latin altus, high + STRATUS.]
McGraw-Hill Dictionary of Aviation:
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altostratus
A grayish or bluish cloud sheet or layer of striated, fibrous, or uniform appearance; totally or partially covering the sky; and having parts thin enough to reveal the sun at least vaguely. Altostratus does not show halo phenomena. On weather charts, altostratus clouds are represented by the symbol 
.
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Random House Word Menu:
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categories related to 'altostratus'
- Clouds - altostratus: dark, drab, thin cloud streaks at middle altitudes
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American Heritage Dictionary
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.
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McGraw-Hill Dictionary of Aviation
An Illustrated Dictionary of Aviation.. Copyright © 2005 by McGraw-Hill Companies, Inc. All rights reserved.
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Random House Word Menu
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